CN1237353C - Cross dichroic prism and reflection type liquid crystal projector using the same - Google Patents
Cross dichroic prism and reflection type liquid crystal projector using the same Download PDFInfo
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- CN1237353C CN1237353C CNB2003101045957A CN200310104595A CN1237353C CN 1237353 C CN1237353 C CN 1237353C CN B2003101045957 A CNB2003101045957 A CN B2003101045957A CN 200310104595 A CN200310104595 A CN 200310104595A CN 1237353 C CN1237353 C CN 1237353C
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2053—Intensity control of illuminating light
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Abstract
A cross dichroic prism for color decomposition includes a blue-reflecting dichroic film for reflecting a blue light component and a red-reflecting dichroic film for reflecting a red light component. Each dichroic film comprises lower and higher refractive index materials alternately laminated on a prism base. The cross dichroic prism satisfies 1.105<=Nh/Ni<=1.450 IF Ng<=Ni, or 1.118<=Nh/Ni<=1.150 IF Ng>Ni, where Ng is the refractive index of the prism base, Nh is the refractive index of the higher refractive index material, and Ni is the refractive index of the lower refractive index material.
Description
Technical field
The present invention relates to a quadrature dichroic prism and a reflective liquid crystal projection apparatus of installing together with one.Luminous flux is by in the oblique reflection-type color liquid crystal projector that is mapped to reflective liquid crystal display device therein, and it is the monochromatic light composition that this quadrature dichroic prism is used to decompose this luminous flux that comes from light source.
Background technology
Usually we know, in the chromatic resolution optical system in the reflective liquid crystal color projecting apparatus, the quadrature dichroic prism is used for light source light is decomposed into red, green and blue three coloured light compositions.
For example, this quadrature dichroic prism is applied in the application shown in Figure 15 A and 15B, and they are respectively side view and vertical view.That is, the light source light that is transformed into the S polarized light incides on the PBS prism 102 through lens 101, then by the polarization separation surface reflection of PBS prism 102.Reflected light is decomposed into red, green and blue three coloured light compositions by quadrature dichroic prism 103.The coloured light composition of this decomposition is incided their corresponding reflective liquid crystal display device 104 to 106.The coloured light composition that incides this reflective liquid crystal display device (being known as LCOS usually) 104 to 106 is modulated by image signals corresponding.Modulated like this coloured light composition is transformed into the P polarized light and is made up by quadrature dichroic prism 103.This combined light is directly seen through the polarization separation surface of PBS 102, and is projected lens 107 and projects to a non-painted screen (undepicted screen).
Above-mentioned to finish the quadrature dichroic prism 103 that look decomposes by two dichroic coatings being made up of multilayer film are glass prisms, and wherein the surface of the surface of red reflex dichroic coating 111 and blue reflection dichroic coating 112 is placed by complete mutually orthogonally.For example, to shown in the 16C, in quadrature dichroic prism 103, every kind of coloured light composition is continuously by the surface of red reflex dichroic coating 111 and the surface of blue reflection dichroic coating 112 as Figure 16 A.That is, the green light composition is by red reflex dichroic coating 111 and blue reflection dichroic coating 112.The red light composition is by 111 reflections of red reflex dichroic coating and see through blue reflection dichroic coating 112.The blue light composition is by 112 reflections of indigo plant reflection dichroic coating and see through red reflex dichroic coating 111.To shown in the 16C, the coloured light composition in first and the latter half of luminous flux is incided on two dichroic coatings 111 and 112 with reciprocal order respectively here as Figure 16 A.Shown in Figure 15 A and 15B, when luminous flux was vertically incided quadrature dichroic prism 103, luminous flux was critical by the sequence independence of dichroic coating 111 and 112.
On the other hand, the configuration (being known as abaxile usually) of our an oblique incidence type knowing recently makes that luminous flux is oblique to be mapped to a reflective liquid crystal display device surface, rather than resembles top described incident vertically.In this oblique incidence type, the optical axis of the optical system of input side and the optical system of outgoing side is not overlapping mutually.Therefore, no longer need the PBS prism 102 that is used to make incident light and output light to be separated from each other of the prior art above-mentioned, this makes and prevents that manufacturing cost from raising, preventing that optical system is heavier and prevent to make the complicated possibility that becomes of optical design owing to the use of PBS prism.
Yet in the oblique incidence type of mentioning in the above, luminous flux is also by the oblique input surface that is used for incident light is decomposed into the quadrature dichroic prism of coloured light composition that is mapped to.As a result, can not be in incident, reflection and transmission that luminous flux is discussed in the plane perpendicular to the axle of quadrature dichroic prism 103 shown in the 16C as Figure 16 A.Up to now, lack from the optical research of the directiveness of this viewpoint, traditional quadrature dichroic prism 103 is also installed with traditional method.
Yet, as inventor's's empirical tests, when shown in Figure 15 A and 15B, the quadrature dichroic prism 103 that uses in the prior art is when being applied to oblique incidence type above-mentioned, and the amount of every kind of coloured light composition changes according to the order of the incident on dichroic coating 111 and 112.Like this, to shown in the 16C, the amount of the light that obtains can change between first and the latter half of incident flux as Figure 16 A.As a result, projecting to the color harmony light intensity of the image on the screen can variation between right and a left side (or upper and lower) part.
Summary of the invention
In order to overcome this problem, one of target of the present invention provides a quadrature dichroic prism, the chromatic resolution optical system that is used for an oblique incidence reflective liquid crystal projection apparatus, can prevent the different quantitative changeizations that make light of incident order, thereby foundation projects to the favourable balance of color harmony light intensity between the right side of the image on the screen and left or up and lower part owing to the luminous flux of red and blue reflection dichroic coating; And the reflective liquid crystal projection apparatus that this quadrature dichroic prism of use is provided.
The invention provides one and be used for the quadrature dichroic prism that look decomposes, this quadrature dichroic prism and a reflective liquid crystal projection apparatus are together installed, be used on reflective liquid crystal display device producing luminous flux from the light source of an oblique incidence, this quadrature dichroic prism sees through the green light composition, and makes indigo plant and red light composition reflex to leading portion (upstream) different directions from each other with reflective liquid crystal display device;
This quadrature dichroic prism comprises the indigo plant reflection dichroic coating and the red reflex dichroic coating that is used for the reflect red composition that are used for the reflect blue composition, and each indigo plant and red reflex dichroic coating comprise the low and higher refractive index materials that alternately is plated on the prism matrix;
This quadrature dichroic prism meet the following conditions expression formula (1) or (2):
If N
g≤ N
l, 1.105≤N then
h/ N
l≤ 1.450 (1), or
If N
g＞N
l, 1.118≤N then
h/ N
l≤ 1.150 (2)
N wherein
gBe the refractive index of prism matrix (base), N
hBe the refractive index of high index material, and N
lIt is refractive index than low-index material.
Here, term " tiltedly " meaning is meant that in the xsect of the axle that comprises a quadrature dichroic prism incident angle of the luminous flux on the light receiving surface of this prism is 20 to 40 degree.
Preferably, when satisfying above-mentioned conditional expression (1), the high index material is from Nb
2O
5, TiO
2, Ta
2O
5, LaTiO
3, HfO
2, ZrO
2And La
2XAl
2YO
3 (X+Y)Select material in the group, and than low-index material from LaTiO
3, HfO
2, ZrO
2, La
2XAl
2YO
3 (X+Y), Y
2O
3, PrAlO
3And Al
2O
3Select material in the group.
Preferably, when satisfying above-mentioned conditional expression (2), the high index material is Al
2O
3, and be SiO than low-index material
2
Preferably, the prism matrix is to be made by glass material BK7.
Preferably, blue reflection dichroic coating is formed by 23 to 29 layers, and the red reflex dichroic coating is formed by 19 to 25 layers.
Preferably, in indigo plant and red reflex dichroic coating, the one deck at least in the most following and the superiors is by making than low-index material.
Preferably, at least one indigo plant and red reflex dichroic coating are made up of odd-level.
The invention provides a reflective liquid crystal projection apparatus, comprise one according to quadrature dichroic prism of the present invention, the luminous flux that wherein comes from light source is so that this luminous flux favours the angle of the axle of this quadrature dichroic prism, on the oblique entering surface that is mapped to this quadrature dichroic prism.
Description of drawings
Figure 1A and 1B are respectively side view and vertical view, schematically explain quadrature dichroic prism according to an embodiment of the invention and incide relation between luminous flux on it;
Fig. 2 is a synoptic diagram, shows the configuration of reflective liquid crystal projection apparatus according to an embodiment of the invention;
Fig. 3 is a synoptic diagram, is presented at the layer configuration of a dichroic coating in the quadrature dichroic prism according to an embodiment of the invention;
Fig. 4 A is a curve to 4C, shows respectively, and when by using when realizing that according to the quadrature dichroic prism of example 1 of the present invention look decomposes, the wavelength characteristic of the test of green, indigo plant and red light composition;
Fig. 5 A is a curve to 5C, shows respectively, and when by using when realizing that according to the quadrature dichroic prism of example 2 of the present invention look decomposes, the wavelength characteristic of the test of green, indigo plant and red light composition;
Fig. 6 A is a curve to 6C, shows respectively, and when by using when realizing that according to the quadrature dichroic prism of example 3 of the present invention look decomposes, the wavelength characteristic of the test of green, indigo plant and red light composition;
Fig. 7 A is a curve to 7C, shows respectively, and when by using when realizing that according to the quadrature dichroic prism of example 4 of the present invention look decomposes, the wavelength characteristic of the test of green, indigo plant and red light composition;
Fig. 8 A is a curve to 8C, shows respectively, and when by using when realizing that according to the quadrature dichroic prism of example 5 of the present invention look decomposes, the wavelength characteristic of the test of green, indigo plant and red light composition;
Fig. 9 A is a curve to 9C, shows respectively, and when by using when realizing that according to the quadrature dichroic prism of comparative example 1 of the present invention look decomposes, the wavelength characteristic of the test of green, indigo plant and red light composition;
Figure 10 A is a curve to 10C, shows respectively, and when by using when realizing that according to the quadrature dichroic prism of comparative example 2 of the present invention look decomposes, the wavelength characteristic of the test of green, indigo plant and red light composition;
Figure 11 A is a curve to 11C, shows respectively, and when by using when realizing that according to the quadrature dichroic prism of comparative example 3 of the present invention look decomposes, the wavelength characteristic of the test of green, indigo plant and red light composition;
Figure 12 A is a curve to 12C, shows respectively, and when by using when realizing that according to the quadrature dichroic prism of comparative example 4 of the present invention look decomposes, the wavelength characteristic of the test of green, indigo plant and red light composition;
Figure 13 A is a curve to 13C, shows respectively, and when by using when realizing that according to the quadrature dichroic prism of comparative example 5 of the present invention look decomposes, the wavelength characteristic of the test of green, indigo plant and red light composition;
Figure 14 A and 14B are respectively side view and vertical view, explain the condition be used to test according to the wavelength characteristic of the quadrature dichroic prism of example of the present invention and comparative example;
Figure 15 A and 15B are respectively side view and vertical view, are used to explain prior art; And
Figure 16 A is a synoptic diagram to 16C, is used for explaining respectively at green, indigo plant and ruddiness composition
A problem of prior art.
Embodiment
Explain below with reference to the accompanying drawings, according to quadrature dichroic prism of the present invention and use the embodiment of the reflective liquid crystal projection apparatus of this quadrature dichroic prism.
Fig. 2 is a synoptic diagram, shows the reflective liquid crystal projection apparatus according to an embodiment.Though this projector is a color projecting apparatus that comprises the reflective liquid crystal display device (being referenced as LCOS) that corresponds respectively to red, green and blue coloured light composition, but for the ease of explaining, Fig. 2 only shows a reflective liquid crystal display device corresponding to green glow, and following explanation will concentrate on green passage.
Among Fig. 2, the unpolarized white light that light source 11 sends is as the illumination light of output, and the fly's eye of being formed by a pair of lens array sheet 12 is according in the homogenising perpendicular to the light quantity in the xsect of optical axis Z.The overall optical flux is polarized transducer (comb filter) 13 and is transformed into the S polarized light.After the S polarized light sees through a collector lens,, only there is the green glow composition to be transformed into the P polarized light by a special coloured light polarisation transformer 15, and a feasible quadrature dichroic prism 16 that incides as chromatic resolution optical system.
In the luminous flux that incides quadrature dichroic prism 16, green glow composition (P polarized light) is through, and indigo plant is reflected on relative direction (side) with the red light composition, and this luminous flux is broken down into the primaries composition thus.Like this, make separated green glow composition through being used to block the polarizer 17 and the lens 18 of veiling glare, obliquely be mapped to a reflective liquid crystal display device 19 that is used for green glow.
Then, show that a width of cloth is used for this reflective liquid crystal display device 19 output green glow compositions of image of green glow as carrying the S polarized light of this image information.Behind the scioptics 18, the S polarized light is used to realize that by one the phase plate 20 of P-S polarisation transformation is transformed into the P polarized light, and incides quadrature dichroic prism 21 then.
Be similar to very much in the red and blue channel of above-mentioned green passage in configuration, the red and blue light ingredient that is separated by quadrature dichroic prism 16 carries red respectively and the blue light image, and incides the side of look synthetic quadrature dichroic prism 21.
As a result, be projected lens 22 by look synthetic quadrature dichroic prism 21 these synthetic coloured light compositions and project on the non-painted screen, piece image is displayed on this screen thus.
Light source 11 has one can effectively utilize the reflection of light device.For example, light source 11 can be metal halide lamp, high-pressure sodium lamp and halogen tungsten lamp etc.
As mentioned above, in the oblique incidence reflective liquid crystal projection apparatus, luminous flux is by on the oblique entering surface that is mapped to quadrature dichroic prism 16, and decomposing this incident light is the monochromatic light composition.Promptly shown in Figure 1A and 1B, they are respectively side view and vertical view, and in vertical view (seeing Figure 1B), incident light impinges perpendicularly on the entering surface of quadrature dichroic prism 16, in side view (seeing Figure 1A), incident light is oblique to be mapped on the entering surface of quadrature dichroic prism 16.In the xsect that comprises the prism optical axis, luminous flux is about 20 with respect to the incident angle of the entering surface of quadrature dichroic prism 16 and spends to 40 degree.
Shown in Figure 15 A and 15B, during the quadrature dichroic prism 103 that in using prior art, uses, the amount of coloured light composition according to light on dichroic coating the incident order and change.That is, to shown in the 16C, the amount of the light that obtains can change between first and the latter half of incident flux as Figure 16 A.As a result, the color harmony light intensity that projects to the image on the screen can change between the right side and left half.
Therefore, in the present embodiment, the layer configuration (material of composition layer, number of plies or the like) of red reflex dichroic coating 31 in quadrature dichroic prism 16 and blue reflection dichroic coating 32 is appropriately determin, to overcome above mentioned problem.
Fig. 3 schematically shows the dichroic coating 31 of quadrature dichroic prism according to an embodiment of the invention and 32 layer configuration.
Blue reflection dichroic coating 32 is made up of 23 to 29 odd-level.Red reflex dichroic coating 31 is made up of 19 to 25 odd-level.
If N
g≤ N
l, 1.105≤N then
h/ N
l≤ 1.450 (1), or
If N
g＞N
l, 1.118≤N then
h/ N
l≤ 1.150 (2)
N wherein
gBe the refractive index of prism matrix, N
hBe the refractive index of high index material, and N
lIt is refractive index than low-index material.
Below table 1 be presented at the scope that satisfies expression formula above-mentioned (1) or (2) in the combination of predetermined substance.
In the table 1, the scope of the combination that single line surrounds is the scope of expression formula (1) of satisfying condition, and the scope of the combination that two-wire surrounds is the scope of expression formula (2) of satisfying condition.In the table 1, selected title material and refractive index (wavelength 632.8nm place) thereof as the high index material going up two rows most with the horizontal direction arrangement, and selected conduct is arranged with vertical direction at the most left two row than the title material and the refractive index (wavelength 632.8nm place) thereof of low-index material.For example, write on Nb
2O
5Row and Al
2O
3The value 1.443 expressions N above-mentioned of row intersection region
h/ N
lValue.Since this zone is dropped in the scope of the combination that thick single line surrounds, then expression ought be selected Nb respectively
2O
5And Al
2O
3As higher and during than low-index material, the expression formula that satisfies condition (1).
Prism matrix (glass substrate) 40 is used for plating dichroic coating 31 and 32 thereon, because good optical performance, outstanding plated film characteristic and low cost, so select BK7 (refractive index is 1.5146) as the prism matrix.
Particularly, when selecting Nb
2O
5Or TiO
2During as the high index material, select LaTiO
3, HfO
2, ZrO
2, La
2XAl
2YO
3 (X+Y), Y
2O
3, PrAlO
3And Al
2O
3In a kind of conduct than low-index material.
When selecting Ta
2O
5During as the high index material, select HfO
2, ZrO
2, La
2XAl
2YO
3 (X+Y), Y
2O
3, PrAlO
3And Al
2O
3In a kind of conduct than low-index material.
When selecting LaTiO
3During as the high index material, select Y
2O
3, PrAlO
3And Al
2O
3In a kind of conduct than low-index material.
When selecting La
2XAl
2YO
3 (X+Y)During as the high index material, select Al
2O
3As than low-index material.
When selecting Al
2O
3During as the high index material, select SiO
2As than low-index material.Also satisfy condition expression formula (2) and be suitable for making of this combination.
LaTiO above-mentioned
3, PrAlO
3And La
2XAl
2YO
3 (X+Y)With the name of product be respectively Substance H4 Patinal, Substance M1 Patinal and Substance M3Patinal (every kind all is the registered trademark of Merck) for famous.
The quadrature dichroic prism of this configuration of present embodiment can prevent the different quantitative changeizations that make output light of incident order owing to the luminous flux of red and blue reflection dichroic coating, thereby foundation projects to the favourable balance of color harmony light intensity between the right side of the image on the screen and left half.
Good effect above-mentioned also can obtain promoting by one of following way: (i) dichroic coating is minimum and top by forming than low refractive index material layer, (ii) blue reflection dichroic coating is made up of 23 to 29 odd-level, and (iii) the red reflex dichroic coating is made up of 19 to 25 odd-level.
Not strictly be limited to embodiment above-mentioned, quadrature dichroic prism of the present invention and use the reflective liquid crystal projection apparatus of quadrature dichroic prism to make amendment in many ways.For example, forming not strict those materials that are limited to embodiment above-mentioned of material of layer, can be that the various materials of conditional expression above-mentioned (1) or (2) are satisfied in combination.
For example, (Optron makes OH-5; TiO
2+ ZrO
2), ((registered trademark) Merck makes Substance H1Patinal; TiO
2+ ZrO
2), ((registered trademark) Merck makes Substance H5Patinal; LaTi
xO
y), and the similar material that can be used as the high index material.On the other hand, (Optron makes OM-4; Al
2O
3+ ZrO
2), (Optron makes OM-6; Al
2O
3+ ZrO
2), and can be used as similar material than low-index material.
The minimum and/or top of dichroic coating can be the high index material, but should have the number of plies of even number.
The not strict BK7 that is limited to, the various matrixes with good optical performance and outstanding plated film characteristic can be as the matrix of this quadrature dichroic prism.
With reference now to specific example, is further explained in detail the present invention.Figure 14 A and 14B are respectively side view and vertical view, explain the condition be used to test according to the wavelength characteristic of the quadrature dichroic prism of following Example and comparative example.
Example 1
Adopt BK7 as the prism matrix according to the dichroic coating in the quadrature dichroic prism of example 1, and Al
2O
3Make than low refractive index material layer (refractive index N
lBe 1.646) and Ta
2O
5High index material layer (the refractive index N that makes
hBe 2.213) alternately be plated on the prism matrix by the steam plating.
Minimum (ground floor) of dichroic coating and top can be Al
2O
3Make than low-index material.Blue reflection dichroic coating is formed by 23 layers, and the red reflex dichroic coating is formed by 19 layers.
Following table 2 shows the composition material and the actual film thickness value thereof of the single layer of every kind of dichroic coating.
Use under incident condition (wavelength is the incident light of 632.8nm), when shown in Figure 15 A and 15B, is respectively side view and vertical view according to the quadrature dichroic prism of example 1, when realizing that look decomposes, and the wavelength characteristic of testing every kind of coloured light composition.N in this example
h/ N
lValue is 1.344, the expression formula that satisfies condition (1).
Fig. 4 A shows test results to 4C (identical to 13C with Fig. 5 A, as to represent green, indigo plant and ruddiness composition respectively).From Fig. 4 A as can be seen to 4C, when luminous flux begins to incide blue reflection dichroic coating, the feature that obtains when inciding red reflex dichroic coating (B-R curve (dotting)) then, and begin to incide the red reflex dichroic coating when luminous flux, it is very consistent inciding the feature that blue reflection dichroic coating obtains when (R-B curve (representing with solid line)) then.
Example 2
Adopt BK7 as the prism matrix according to the dichroic coating in the quadrature dichroic prism of example 2, and PrAlO
3Make than low refractive index material layer (refractive index N
lBe 1.715) and TiO
2High index material layer (the refractive index N that makes
hBe 2.350) alternately be plated on the prism matrix by the steam plating.
Minimum (ground floor) of dichroic coating and top can be PrAlO
3Make than low-index material.Blue reflection dichroic coating is formed by 23 layers, and the red reflex dichroic coating is formed by 19 layers.
Use under incident condition (wavelength is the incident light of 632.8nm), when shown in Figure 15 A and 15B, is respectively side view and vertical view according to the quadrature dichroic prism of example 2, when realizing that look decomposes, and the wavelength characteristic of testing every kind of coloured light composition.N in this example
h/ N
lValue is 1.371, the expression formula that satisfies condition (1).
Fig. 5 A shows test results to 5C.From Fig. 5 A as can be seen to 5C, when luminous flux begins to incide blue reflection dichroic coating, the feature that obtains when inciding red reflex dichroic coating (B-R curve (dotting)) then, and begin to incide the red reflex dichroic coating when luminous flux, it is very consistent inciding the feature that blue reflection dichroic coating obtains when (R-B curve (representing with solid line)) then.
Example 3
Adopt BK7 as the prism matrix according to the dichroic coating in the quadrature dichroic prism of example 3, and Al
2O
3Make than low refractive index material layer (refractive index N
lBe 1.646) and TiO
2High index material layer (the refractive index N that makes
hBe 2.350) alternately be plated on the prism matrix by the steam plating.
Minimum (ground floor) of dichroic coating and top can be Al
2O
3Make than low-index material.Blue reflection dichroic coating is formed by 23 layers, and the red reflex dichroic coating is formed by 19 layers.
Use under incident condition (wavelength is the incident light of 632.8nm), when shown in Figure 15 A and 15B, is respectively side view and vertical view according to the quadrature dichroic prism of example 3, when realizing that look decomposes, and the wavelength characteristic of testing every kind of coloured light composition.N in this example
h/ N
lValue is 1.427, the expression formula that satisfies condition (1).
Fig. 6 A shows test results to 6C.From Fig. 6 A as can be seen to 6C, when luminous flux begins to incide blue reflection dichroic coating, the feature that obtains when inciding red reflex dichroic coating (B-R curve (dotting)) then, and begin to incide the red reflex dichroic coating when luminous flux, it is very consistent inciding the feature that blue reflection dichroic coating obtains when (R-B curve (representing with solid line)) then.
Example 4
Adopt BK7 as the prism matrix according to the dichroic coating in the quadrature dichroic prism of example 4, and Al
2O
3Make than low refractive index material layer (refractive index N
lBe 1.646) and LaTiO
3High index material layer (the refractive index N that makes
hBe 2.081) alternately be plated on the prism matrix by the steam plating.
Minimum (ground floor) of dichroic coating and top can be Al
2O
3Make than low-index material.Blue reflection dichroic coating is formed by 23 layers, and the red reflex dichroic coating is formed by 19 layers.
Use under incident condition (wavelength is the incident light of 632.8nm), when shown in Figure 15 A and 15B, is respectively side view and vertical view according to the quadrature dichroic prism of example 4, when realizing that look decomposes, and the wavelength characteristic of testing every kind of coloured light composition.N in this example
h/ N
lValue is 1.264, the expression formula that satisfies condition (1).
Fig. 7 A shows test results to 7C.From Fig. 7 A as can be seen to 7C, when luminous flux begins to incide blue reflection dichroic coating, the feature that obtains when inciding red reflex dichroic coating (B-R curve (dotting)) then, and begin to incide the red reflex dichroic coating when luminous flux, it is very consistent inciding the feature that blue reflection dichroic coating obtains when (R-B curve (representing with solid line)) then.
Example 5
Adopt BK7 as the prism matrix according to the dichroic coating in the quadrature dichroic prism of example 5, and SiO
2Make than low refractive index material layer (refractive index N
lBe 1.470) and Al
2O
3High index material layer (the refractive index N that makes
hBe 1.646) alternately be plated on the prism matrix by the steam plating.
Minimum (ground floor) of dichroic coating and top can be SiO
2Make than low-index material.Blue reflection dichroic coating is formed by 27 layers, and the red reflex dichroic coating is formed by 25 layers.
Following table 3 shows the composition material and the actual film thickness value thereof of the single layer of every kind of dichroic coating.
Use under incident condition (wavelength is the incident light of 632.8nm), when shown in Figure 15 A and 15B, is respectively side view and vertical view according to the quadrature dichroic prism of example 5, when realizing that look decomposes, and the wavelength characteristic of testing every kind of coloured light composition.N in this example
h/ N
lValue is 1.120, the expression formula that satisfies condition (2).
Fig. 8 A shows test results to 8C.From Fig. 8 A as can be seen to 8C, when luminous flux begins to incide blue reflection dichroic coating, the feature that obtains when inciding red reflex dichroic coating (B-R curve (dotting)) then, and begin to incide the red reflex dichroic coating when luminous flux, it is very consistent inciding the feature that blue reflection dichroic coating obtains when (R-B curve (representing with solid line)) then.
Comparative example 1
Adopt BK7 as the prism matrix according to the dichroic coating in the quadrature dichroic prism of comparative example 1, and SiO
2Make than low refractive index material layer (refractive index N
lBe 1.470) and TiO
2High index material layer (the refractive index N that makes
hBe 2.350) alternately be plated on the prism matrix by the steam plating.
Minimum (ground floor) of dichroic coating and top can be SiO
2Make than low-index material.Blue reflection dichroic coating is formed by 23 layers, and the red reflex dichroic coating is formed by 17 layers.
Use under incident condition (wavelength is the incident light of 632.8nm), when shown in Figure 15 A and 15B, is respectively side view and vertical view according to the quadrature dichroic prism of comparative example 1, when realizing that look decomposes, and the wavelength characteristic of testing every kind of coloured light composition.Though the N in this comparative example
g＞N
lBut, N
h/ N
lValue is 1.599, does not satisfy in conditional expression (1) and (2) any one.
Fig. 9 A shows test results to 9C.From Fig. 9 A as can be seen to 9C, when luminous flux begins to incide blue reflection dichroic coating, the feature that obtains when inciding red reflex dichroic coating (B-R curve (dotting)) then, and begin to incide the red reflex dichroic coating when luminous flux, inciding the feature that blue reflection dichroic coating obtains when (R-B curve (representing with solid line)) then has very large deviation.
Comparative example 2
Adopt BK7 as the prism matrix according to the dichroic coating in the quadrature dichroic prism of comparative example 2, and SiO
2Make than low refractive index material layer (refractive index N
lBe 1.470) and Ta
2O
5High index material layer (the refractive index N that makes
hBe 2.213) alternately be plated on the prism matrix by the steam plating.
Minimum (ground floor) of dichroic coating and top can be SiO
2Make than low-index material.Blue reflection dichroic coating is formed by 23 layers, and the red reflex dichroic coating is formed by 17 layers.
Following table 4 shows the composition material and the actual film thickness value thereof of the single layer of every kind of dichroic coating.
Use under incident condition (wavelength is the incident light of 632.8nm), when shown in Figure 15 A and 15B, is respectively side view and vertical view according to the quadrature dichroic prism of comparative example 2, when realizing that look decomposes, and the wavelength characteristic of testing every kind of coloured light composition.Though the N in this comparative example
g＞N
lBut, N
h/ N
lValue is 1.506, does not satisfy in conditional expression (1) and (2) any one.
Figure 10 A shows test results to 10C.From Figure 10 A as can be seen to 10C, when luminous flux begins to incide blue reflection dichroic coating, the feature that obtains when inciding red reflex dichroic coating (B-R curve (dotting)) then, and begin to incide the red reflex dichroic coating when luminous flux, inciding the feature that blue reflection dichroic coating obtains when (R-B curve (representing with solid line)) then has very large deviation.
Comparative example 3
Adopt BK7 as the prism matrix according to the dichroic coating in the quadrature dichroic prism of comparative example 3, and SiO
2Make than low refractive index material layer (refractive index N
lBe 1.470) and LaTiO
3High index material layer (the refractive index N that makes
hBe 2.081) alternately be plated on the prism matrix by the steam plating.
Minimum (ground floor) of dichroic coating and top can be SiO
2Make than low-index material.Blue reflection dichroic coating is formed by 23 layers, and the red reflex dichroic coating is formed by 17 layers.
Use under incident condition (wavelength is the incident light of 632.8nm), when shown in Figure 15 A and 15B, is respectively side view and vertical view according to the quadrature dichroic prism of comparative example 3, when realizing that look decomposes, and the wavelength characteristic of testing every kind of coloured light composition.Though the N in this comparative example
g＞N
lBut, N
h/ N
lValue is 1.416, does not satisfy in conditional expression (1) and (2) any one.
Figure 11 A shows test results to 11C.From Figure 11 A as can be seen to 11C, when luminous flux begins to incide blue reflection dichroic coating, the feature that obtains when inciding red reflex dichroic coating (B-R curve (dotting)) then, and begin to incide the red reflex dichroic coating when luminous flux, inciding the feature that blue reflection dichroic coating obtains when (R-B curve (representing with solid line)) then has very large deviation.
Comparative example 4
Adopt BK7 as the prism matrix according to the dichroic coating in the quadrature dichroic prism of comparative example 4, and SiO
2Make than low refractive index material layer (refractive index N
lBe 1.470) and La
2XAl
2YO
3 (X+Y)High index material layer (the refractive index N that makes
hBe 1.820) alternately be plated on the prism matrix by the steam plating.
Minimum (ground floor) of dichroic coating and top can be SiO
2Make than low-index material.Blue reflection dichroic coating is formed by 25 layers, and the red reflex dichroic coating is formed by 23 layers.
Use under incident condition (wavelength is the incident light of 632.8nm), when shown in Figure 15 A and 15B, is respectively side view and vertical view according to the quadrature dichroic prism of comparative example 4, when realizing that look decomposes, and the wavelength characteristic of testing every kind of coloured light composition.Though the N in this comparative example
g＞N
lBut, N
h/ N
lValue is 1.238, does not satisfy in conditional expression (1) and (2) any one.
Figure 12 A shows test results to 12C.From Figure 12 A as can be seen to 12C, when luminous flux begins to incide blue reflection dichroic coating, the feature that obtains when inciding red reflex dichroic coating (B-R curve (dotting)) then, and begin to incide the red reflex dichroic coating when luminous flux, inciding the feature that blue reflection dichroic coating obtains when (R-B curve (representing with solid line)) then has very large deviation.
Comparative example 5
Adopt BK7 as the prism matrix according to the dichroic coating in the quadrature dichroic prism of comparative example 5, and SiO
2Make than low refractive index material layer (refractive index N
lBe 1.470) and PrAlO
3High index material layer (the refractive index N that makes
hBe 1.715) alternately be plated on the prism matrix by the steam plating.
Minimum (ground floor) of dichroic coating and top can be SiO
2Make than low-index material.Blue reflection dichroic coating is formed by 25 layers, and the red reflex dichroic coating is formed by 23 layers.
Use under incident condition (wavelength is the incident light of 632.8nm), when shown in Figure 15 A and 15B, is respectively side view and vertical view according to the quadrature dichroic prism of comparative example 5, when realizing that look decomposes, and the wavelength characteristic of testing every kind of coloured light composition.Though the N in this comparative example
g＞N
lBut, N
h/ N
lValue is 1.166, does not satisfy in conditional expression (1) and (2) any one.
Figure 13 A shows test results to 13C.From Figure 13 A as can be seen to 13C, when luminous flux begins to incide blue reflection dichroic coating, the feature that obtains when inciding red reflex dichroic coating (B-R curve (dotting)) then, and begin to incide the red reflex dichroic coating when luminous flux, inciding the feature that blue reflection dichroic coating obtains when (R-B curve (representing with solid line)) then has very large deviation.
Table 5 has been summed up the result of example above-mentioned and comparative example.
Just as explained above, according to quadrature dichroic prism of the present invention and use the reflective liquid crystal projection apparatus of this quadrature dichroic prism, come definitions section to become the higher of dichroic coating and than low-index material according to predetermined refractive index function, thereby can prevent the different quantitative changeizations of exporting light that make of incident order, even in the oblique reflective liquid crystal projection apparatus that is mapped to reflective liquid crystal display device of luminous flux that comes from light source owing to the luminous flux of red and blue reflection dichroic coating.Can set up the favourable balance of color harmony light intensity between the right side that projects to the image on this screen and left half like this.
Table 1
The refractive index of every kind of material (wavelength 632.8nm place)
Table 2
| Blue reflection dichroic prism | The red reflex dichroic prism | ||||
| Level number | Material | Actual (real) thickness (nm) | Level number | Material | Actual (real) thickness (nm) |
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 | Al 2O 3 Ta 2O 5 Al 2O 3 Ta 2O 5 Al 2O 3 Ta 2O 5 Al 2O 3 Ta 2O 5 Al 2O 3 Ta 2O 5 Al 2O 3 Ta 2O 5 Al 2O 3 Ta 2O 5 Al 2O 3 Ta 2O 5 Al 2O 3 Ta 2O 5 Al 2O 3 Ta 2O 5 Al 2O 3 Ta 2O 5 Al 2O 3 | 103.85 18.32 52.76 73.47 41.34 74.03 48.78 86.06 43 79.81 48.41 84.79 43.33 84.42 43.83 86.19 41.81 84.15 36.17 84.86 54.52 25.13 72.19 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | Al 2O 3 Ta 2O 5 Al 2O 3 Ta 2O 5 Al 2O 3 Ta 2O 5 Al 2O 3 Ta 2O 5 Al 2O 3 Ta 2O 5 Al 2O 3 Ta 2O 5 Al 2O 3 Ta 2O 5 Al 2O 3 Ta 2O 5 Al 2O 3 Ta 2O 5 Al 2O 3 | 83.9 125.04 53.68 126.29 84.33 117.51 85.99 117.42 72.98 119.51 72.98 117.42 85.99 117.51 84.33 126.29 53.68 125.04 83.9 |
Al
2O
3Refractive index (wavelength 632.8nm place): 1.646
Ta
2O
5Refractive index (wavelength 632.8nm place): 2.213
The refractive index of glass substrate (BK7) (wavelength 632.8nm place): 1.515
Table 3
| Blue reflection dichroic prism | The red reflex dichroic prism | ||||
| Level number | Material | Actual (real) thickness (nm) | Level number | Material | Actual (real) thickness (nm) |
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 | SiO 2 Al 2O 3 SiO 2 Al 2O 3 SiO 2 Al 2O 3 SiO 2 Al 2O 3 SiO 2 Al 2O 3 SiO 2 Al 2O 3 SiO 2 Al 2O 3 SiO 2 Al 2O 3 SiO 2 Al 2O 3 SiO 2 Al 2O 3 SiO 2 Al 2O 3 SiO 2 Al 2O 3 SiO 2 Al 2O 3 SiO 2 | 87.35 68.37 90.89 88.92 103.2 91.19 101.19 90.89 103.95 94.12 104.94 92.55 102.94 92.55 102.94 92.55 104.94 94.12 103.95 90.89 101.19 91.19 103.2 88.92 90.89 68.37 87.35 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 | SiO 2 Al 2O 3 SiO 2 Al 2O 3 SiO 2 Al 2O 3 SiO 2 Al 2O 3 SiO 2 Al 2O 3 SiO 2 Al 2O 3 SiO 2 Al 2O 3 SiO 2 Al 2O 3 SiO 2 Al 2O 3 SiO 2 Al 2O 3 SiO 2 Al 2O 3 SiO 2 Al 2O 3 SiO 2 | 181.244 157.416 167.686 144.529 160.096 141.38 157.856 139.329 156.579 138.991 155.763 138.991 155.763 137.862 155.763 138.991 156.579 139.329 157.856 141.38 160.096 144.529 167.686 157.416 181.244 |
SiO
2Refractive index (wavelength 632.8nm place): 1.470
Al
2O
3Refractive index (wavelength 632.8nm place): 1.646
The refractive index of glass substrate (BK7) (wavelength 632.8nm place): 1.515
Table 4
| Blue reflection dichroic prism | The red reflex dichroic prism | ||||
| Level number | Material | Actual (real) thickness (nm) | Level number | Material | Actual (real) thickness (nm) |
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 | SiO 2 Ta 2O 5 SiO 2 Ta 2O 5 SiO 2 Ta 2O 5 SiO 2 Ta 2O 5 SiO 2 Ta 2O 5 SiO 2 Ta 2O 5 SiO 2 Ta 2O 5 SiO 2 Ta 2O 5 SiO 2 Ta 2O 5 SiO 2 Ta 2O 5 SiO 2 Ta 2O 5 SiO 2 | 100 28.372 64.661 75.857 46.521 73.768 50.276 87.893 44.185 79.187 49.573 85.16 44.62 84.282 44.819 85.572 43.433 83.708 37.392 85.471 62.3 31.056 82.966 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | SiO 2 Ta 2O 5 SiO 2 Ta 2O 5 SiO 2 Ta 2O 5 SiO 2 Ta 2O 5 SiO 2 Ta 2O 5 SiO 2 Ta 2O 5 SiO 2 Ta 2O 5 SiO 2 Ta 2O 5 SiO 2 | 241.5 131.117 66.961 134.534 97.904 127.069 92.539 127.024 80.771 127.474 87.472 128.901 91.953 133.699 74.359 130.831 39.016 |
SiO
2Refractive index (wavelength 632.8nm place): 1.470
Ta
2O
5Refractive index (wavelength 632.8nm place): 2.213
The refractive index of glass substrate (BK7) (wavelength 632.8nm place): 1.515
Table 5
| The high index material | Than the low-refraction material | Refractive indices | The result | The number of plies of multilayer film | |||
| Material | Refractive index | Material | Refractive index | Blue reflection | Red reflex | ||
| Ta 2O 5 TiO 2 TiO 2 LaTiO 3 Al 2O 3 TiO 2 Ta 2O 5 LaTiO 3 La 2XAl 2YO 3(X-Y) PrAlO 3 | 2.213 2.350 2.350 2.081 1.646 2.350 2.213 2.081 1.820 1.715 | Al 2O 3 PrAlO 3 Al 2O 3 Al 2O 3 SiO 2 SiO 2 SiO 2 SiO 2 SiO 2 SiO 2 | 1.646 1.715 1.646 1.646 1.470 1.470 1.470 1.470 1.470 1.470 | 1.344 1.371 1.427 1.264 1.120 1.599 1.506 1.416 1.238 1.166 | ○ ○ ○ ○ ○ × × × × × | 23 23 23 23 27 23 23 23 25 25 | 19 19 19 19 25 17 17 17 23 23 |
Claims (7)
1. one kind is used for the quadrature dichroic prism that look decomposes, this quadrature dichroic prism and a reflective liquid crystal projection apparatus are together installed, and be arranged between light source and the reflective liquid crystal display device, be used on reflective liquid crystal display device producing luminous flux from the light source of an oblique incidence, this quadrature dichroic prism sees through the green light composition, and make indigo plant and red light composition reflex to different directions from each other, it is characterized in that, this quadrature dichroic prism comprises:
An indigo plant reflection dichroic coating and a red reflex dichroic coating that is used for the reflect red composition that is used for the reflect blue composition, each indigo plant and red reflex dichroic coating comprise the low and higher refractive index materials that alternately is plated on the prism matrix;
This quadrature dichroic prism meet the following conditions expression formula (1) or (2):
If N
g≤ N
1, 1.105≤N then
h/ N
1≤ 1.450 (1), or
If N
g＞N
1, 1.118≤N then
h/ N
1≤ 1.150 (2)
N wherein
gBe the refractive index of prism matrix, N
hBe the refractive index of high index material, and N
1It is refractive index than low-index material.
2. according to the quadrature dichroic prism of claim 1, this quadrature dichroic prism expression formula (1) that satisfies condition wherein; Wherein the high index material is from Nb
2O
5, TiO
2, Ta
2O
5, LaTiO
3, HfO
2, ZrO
2And La
2XAl
2YO
3(X+Y) select material in the group; And wherein than low-index material from LaTiO
3, HfO
2, ZrO
2, La
2XAl
2YO
3(X+Y), Y
2O
3, PrAlO
3And Al
2O
3Select material in the group.
3. according to the quadrature dichroic prism of claim 2, wherein this prism matrix is made by glass material BK7.
4. according to the quadrature dichroic prism of claim 1, this quadrature dichroic prism expression formula (2) that satisfies condition wherein; Wherein the high index material is Al
2O
3And be SiO wherein than low-index material
2
5. according to the quadrature dichroic prism of claim 4, wherein this prism matrix is made by glass material BK7.
6. according to the quadrature dichroic prism of claim 1, form one of at least in its medium blue reflection dichroic coating and the red reflex dichroic coating by odd-level.
7. reflective liquid crystal projection apparatus, comprise quadrature dichroic prism according to claim 1, the luminous flux that wherein comes from light source is so that this luminous flux favours the angle of the axle of this quadrature dichroic prism, on the oblique entering surface that is mapped to this quadrature dichroic prism.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP330431/2002 | 2002-11-14 | ||
| JP2002330431A JP2004163714A (en) | 2002-11-14 | 2002-11-14 | Cross dichroic prism and reflective liquid crystal projector device using the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1501101A CN1501101A (en) | 2004-06-02 |
| CN1237353C true CN1237353C (en) | 2006-01-18 |
Family
ID=32290098
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2003101045957A Expired - Fee Related CN1237353C (en) | 2002-11-14 | 2003-11-04 | Cross dichroic prism and reflection type liquid crystal projector using the same |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US7066603B2 (en) |
| JP (1) | JP2004163714A (en) |
| CN (1) | CN1237353C (en) |
| DE (1) | DE10353066A1 (en) |
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| US6949297B2 (en) * | 2001-11-02 | 2005-09-27 | 3M Innovative Properties Company | Hybrid adhesives, articles, and methods |
| US6887917B2 (en) * | 2002-12-30 | 2005-05-03 | 3M Innovative Properties Company | Curable pressure sensitive adhesive compositions |
| US7927703B2 (en) * | 2003-04-11 | 2011-04-19 | 3M Innovative Properties Company | Adhesive blends, articles, and methods |
| US7234816B2 (en) * | 2004-02-03 | 2007-06-26 | 3M Innovative Properties Company | Polarizing beam splitter assembly adhesive |
| US7273282B2 (en) * | 2004-10-23 | 2007-09-25 | Hewlett-Packard Development Company, L.P. | Projection system with optical filter |
| US20060146289A1 (en) * | 2004-12-30 | 2006-07-06 | Po Liang Chiang | Optical system for projection display apparatuses |
| JP2006301585A (en) | 2005-03-22 | 2006-11-02 | Seiko Epson Corp | Optical product and method of manufacturing optical product |
| US7616378B2 (en) * | 2005-05-17 | 2009-11-10 | Northrop Grumman Corporation | Dichroic beam splitter and related apparatus and methods |
| TWI262326B (en) * | 2005-09-30 | 2006-09-21 | Delta Electronics Inc | Method and prism for improving illumination efficiency in optical projector systems |
| JP5047547B2 (en) | 2006-07-06 | 2012-10-10 | オリンパス株式会社 | Optical element, two-plate unit including this optical element, imaging device, and endoscope |
| JP2008020563A (en) * | 2006-07-11 | 2008-01-31 | Murakami Corp | Dielectric multilayer film filter |
| JP2011007912A (en) * | 2009-06-24 | 2011-01-13 | Sanyo Electric Co Ltd | Illumination apparatus and projection display apparatus |
| US8376551B2 (en) * | 2010-02-25 | 2013-02-19 | Corning Incorporated | Illumination system for laser projection |
| JP5768411B2 (en) * | 2011-03-04 | 2015-08-26 | セイコーエプソン株式会社 | Method for producing lanthanum titanate particles |
| US9638988B2 (en) | 2013-12-12 | 2017-05-02 | Corning Incorporated | Light multiplexer with color combining element |
| JP6606859B2 (en) * | 2015-05-13 | 2019-11-20 | Ａｇｃ株式会社 | Near-infrared cut filter |
| CN107850705B (en) * | 2015-07-27 | 2020-02-14 | 柯尼卡美能达株式会社 | Silver reflector, and method for manufacturing and inspecting same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5400179A (en) * | 1992-02-18 | 1995-03-21 | Asahi Kogaku Kogyo Kabushiki Kaisha | Optical multilayer thin film and beam splitter |
| US5786937A (en) * | 1996-07-17 | 1998-07-28 | Industrial Technology Research Institute | Thin-film color-selective beam splitter and method of fabricating the same |
| JP2000199883A (en) * | 1998-10-29 | 2000-07-18 | Fujitsu Ltd | Reflective projector |
| JP2001209024A (en) | 1999-11-16 | 2001-08-03 | Sony Corp | Projection display device |
| TW440710B (en) * | 2000-05-16 | 2001-06-16 | Ind Tech Res Inst | A high color purity three-primaries spectrometer |
| US7222967B2 (en) * | 2001-08-10 | 2007-05-29 | Canon Kabushiki Kaisha | Image display optical system and projection type image display apparatus |
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2002
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2003
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| CN1501101A (en) | 2004-06-02 |
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| US7066603B2 (en) | 2006-06-27 |
| JP2004163714A (en) | 2004-06-10 |
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